feat: added more k8s SD metrics

Signed-off-by: Martin Chodur <m.chodur@seznam.cz>

discovery/kubernetes/client_metrics.go

@@ -0,0 +1,246 @@
+// Copyright 2018 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package kubernetes
+
+import (
+	"net/url"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"k8s.io/client-go/tools/cache"
+	"k8s.io/client-go/tools/metrics"
+	"k8s.io/client-go/util/workqueue"
+)
+
+const (
+	cacheMetricsNamespace     = metricsNamespace + "_cache"
+	workqueueMetricsNamespace = metricsNamespace + "_workqueue"
+)
+
+var (
+	// Metrics for client-go's HTTP requests.
+	clientGoRequestResultMetricVec = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Namespace: metricsNamespace,
+			Name:      "http_request_total",
+			Help:      "Total number of HTTP requests to the Kubernetes API by status code.",
+		},
+		[]string{"status_code"},
+	)
+	clientGoRequestLatencyMetricVec = prometheus.NewSummaryVec(
+		prometheus.SummaryOpts{
+			Namespace:  metricsNamespace,
+			Name:       "http_request_duration_seconds",
+			Help:       "Summary of latencies for HTTP requests to the Kubernetes API by endpoint.",
+			Objectives: map[float64]float64{},
+		},
+		[]string{"endpoint"},
+	)
+
+	// Definition of metrics for client-go cache metrics provider.
+	clientGoCacheListTotalMetric = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Namespace: cacheMetricsNamespace,
+			Name:      "list_total",
+			Help:      "Total number of list operations.",
+		},
+	)
+	clientGoCacheListDurationMetric = prometheus.NewSummary(
+		prometheus.SummaryOpts{
+			Namespace:  cacheMetricsNamespace,
+			Name:       "list_duration_seconds",
+			Help:       "Duration of a Kubernetes API call in seconds.",
+			Objectives: map[float64]float64{},
+		},
+	)
+	clientGoCacheItemsInListCountMetric = prometheus.NewSummary(
+		prometheus.SummaryOpts{
+			Namespace:  cacheMetricsNamespace,
+			Name:       "list_items",
+			Help:       "Count of items in a list from the Kubernetes API.",
+			Objectives: map[float64]float64{},
+		},
+	)
+	clientGoCacheWatchesCountMetric = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Namespace: cacheMetricsNamespace,
+			Name:      "watches_total",
+			Help:      "Total number of watch operations.",
+		},
+	)
+	clientGoCacheShortWatchesCountMetric = prometheus.NewCounter(
+		prometheus.CounterOpts{
+			Namespace: cacheMetricsNamespace,
+			Name:      "short_watches_total",
+			Help:      "Total number of short watch operations.",
+		},
+	)
+	clientGoCacheWatchesDurationMetric = prometheus.NewSummary(
+		prometheus.SummaryOpts{
+			Namespace:  cacheMetricsNamespace,
+			Name:       "watch_duration_seconds",
+			Help:       "Duration of watches on the Kubernetes API.",
+			Objectives: map[float64]float64{},
+		},
+	)
+	clientGoCacheItemsInWatchesCountMetric = prometheus.NewSummary(
+		prometheus.SummaryOpts{
+			Namespace:  cacheMetricsNamespace,
+			Name:       "watch_events",
+			Help:       "Number of items in watches on the Kubernetes API.",
+			Objectives: map[float64]float64{},
+		},
+	)
+	clientGoCacheLastResourceVersionMetric = prometheus.NewGauge(
+		prometheus.GaugeOpts{
+			Namespace: cacheMetricsNamespace,
+			Name:      "last_resource_version",
+			Help:      "Last resource version from the Kubernetes API.",
+		},
+	)
+
+	// Definition of metrics for client-go workflow metrics provider
+	clientGoWorkqueueDepthMetricVec = prometheus.NewGaugeVec(
+		prometheus.GaugeOpts{
+			Namespace: workqueueMetricsNamespace,
+			Name:      "depth",
+			Help:      "Current depth of the work queue.",
+		},
+		[]string{"queue_name"},
+	)
+	clientGoWorkqueueAddsMetricVec = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Namespace: workqueueMetricsNamespace,
+			Name:      "items_total",
+			Help:      "Total number of items added to the work queue.",
+		},
+		[]string{"queue_name"},
+	)
+	clientGoWorkqueueLatencyMetricVec = prometheus.NewSummaryVec(
+		prometheus.SummaryOpts{
+			Namespace:  workqueueMetricsNamespace,
+			Name:       "latency_seconds",
+			Help:       "How long an item stays in the work queue.",
+			Objectives: map[float64]float64{},
+		},
+		[]string{"queue_name"},
+	)
+	clientGoWorkqueueWorkDurationMetricVec = prometheus.NewSummaryVec(
+		prometheus.SummaryOpts{
+			Namespace:  workqueueMetricsNamespace,
+			Name:       "work_duration_seconds",
+			Help:       "How long processing an item from the work queue takes.",
+			Objectives: map[float64]float64{},
+		},
+		[]string{"queue_name"},
+	)
+)
+
+// Definition of dummy metric used as a placeholder if we don't want to observe some data.
+type noopMetric struct{}
+
+func (noopMetric) Inc()            {}
+func (noopMetric) Dec()            {}
+func (noopMetric) Observe(float64) {}
+
+// Definition of client-go metrics adapters for HTTP requests observation
+type clientGoRequestMetricAdapter struct{}
+
+func (f *clientGoRequestMetricAdapter) Register(registerer prometheus.Registerer) {
+	metrics.Register(f, f)
+	registerer.MustRegister(clientGoRequestResultMetricVec)
+	registerer.MustRegister(clientGoRequestLatencyMetricVec)
+}
+func (clientGoRequestMetricAdapter) Increment(code string, method string, host string) {
+	clientGoRequestResultMetricVec.WithLabelValues(code).Inc()
+}
+func (clientGoRequestMetricAdapter) Observe(verb string, u url.URL, latency time.Duration) {
+	clientGoRequestLatencyMetricVec.WithLabelValues(u.EscapedPath()).Observe(latency.Seconds())
+}
+
+// Definition of client-go cache metrics provider definition
+type clientGoCacheMetricsProvider struct{}
+
+func (f *clientGoCacheMetricsProvider) Register(registerer prometheus.Registerer) {
+	cache.SetReflectorMetricsProvider(f)
+	registerer.MustRegister(clientGoCacheWatchesDurationMetric)
+	registerer.MustRegister(clientGoCacheWatchesCountMetric)
+	registerer.MustRegister(clientGoCacheListDurationMetric)
+	registerer.MustRegister(clientGoCacheListTotalMetric)
+	registerer.MustRegister(clientGoCacheLastResourceVersionMetric)
+	registerer.MustRegister(clientGoCacheShortWatchesCountMetric)
+	registerer.MustRegister(clientGoCacheItemsInWatchesCountMetric)
+	registerer.MustRegister(clientGoCacheItemsInListCountMetric)
+
+}
+func (clientGoCacheMetricsProvider) NewListsMetric(name string) cache.CounterMetric {
+	return clientGoCacheListTotalMetric
+}
+func (clientGoCacheMetricsProvider) NewListDurationMetric(name string) cache.SummaryMetric {
+	return clientGoCacheListDurationMetric
+}
+func (clientGoCacheMetricsProvider) NewItemsInListMetric(name string) cache.SummaryMetric {
+	return clientGoCacheItemsInListCountMetric
+}
+func (clientGoCacheMetricsProvider) NewWatchesMetric(name string) cache.CounterMetric {
+	return clientGoCacheWatchesCountMetric
+}
+func (clientGoCacheMetricsProvider) NewShortWatchesMetric(name string) cache.CounterMetric {
+	return clientGoCacheShortWatchesCountMetric
+}
+func (clientGoCacheMetricsProvider) NewWatchDurationMetric(name string) cache.SummaryMetric {
+	return clientGoCacheWatchesDurationMetric
+}
+func (clientGoCacheMetricsProvider) NewItemsInWatchMetric(name string) cache.SummaryMetric {
+	return clientGoCacheItemsInWatchesCountMetric
+}
+func (clientGoCacheMetricsProvider) NewLastResourceVersionMetric(name string) cache.GaugeMetric {
+	return clientGoCacheLastResourceVersionMetric
+}
+
+// Definition of client-go workqueue metrics provider definition
+type clientGoWorkqueueMetricsProvider struct{}
+
+func (f *clientGoWorkqueueMetricsProvider) Register(registerer prometheus.Registerer) {
+	workqueue.SetProvider(f)
+	registerer.MustRegister(clientGoWorkqueueDepthMetricVec)
+	registerer.MustRegister(clientGoWorkqueueAddsMetricVec)
+	registerer.MustRegister(clientGoWorkqueueLatencyMetricVec)
+	registerer.MustRegister(clientGoWorkqueueWorkDurationMetricVec)
+}
+
+func (f *clientGoWorkqueueMetricsProvider) NewDepthMetric(name string) workqueue.GaugeMetric {
+	return clientGoWorkqueueDepthMetricVec.WithLabelValues(name)
+}
+func (f *clientGoWorkqueueMetricsProvider) NewAddsMetric(name string) workqueue.CounterMetric {
+	return clientGoWorkqueueAddsMetricVec.WithLabelValues(name)
+}
+func (f *clientGoWorkqueueMetricsProvider) NewLatencyMetric(name string) workqueue.SummaryMetric {
+	metric := clientGoWorkqueueLatencyMetricVec.WithLabelValues(name)
+	// Convert microseconds to seconds for consistency across metrics.
+	return prometheus.ObserverFunc(func(v float64) {
+		metric.Observe(v / 1e6)
+	})
+}
+func (f *clientGoWorkqueueMetricsProvider) NewWorkDurationMetric(name string) workqueue.SummaryMetric {
+	metric := clientGoWorkqueueWorkDurationMetricVec.WithLabelValues(name)
+	// Convert microseconds to seconds for consistency across metrics.
+	return prometheus.ObserverFunc(func(v float64) {
+		metric.Observe(v / 1e6)
+	})
+}
+func (clientGoWorkqueueMetricsProvider) NewRetriesMetric(name string) workqueue.CounterMetric {
+	// Retries are not used so the metric is ommited.
+	return noopMetric{}
+}

discovery/kubernetes/kubernetes.go

@@ -42,12 +42,15 @@ const (
 	// in this discovery.
 	metaLabelPrefix  = model.MetaLabelPrefix + "kubernetes_"
 	namespaceLabel   = metaLabelPrefix + "namespace"
+	metricsNamespace = "prometheus_sd_kubernetes"
 )
 
 var (
+	// Custom events metric
 	eventCount = prometheus.NewCounterVec(
 		prometheus.CounterOpts{
-			Name: "prometheus_sd_kubernetes_events_total",
+			Namespace: metricsNamespace,
+			Name:      "events_total",
 			Help:      "The number of Kubernetes events handled.",
 		},
 		[]string{"role", "event"},
@@ -139,6 +142,17 @@ func init() {
 			eventCount.WithLabelValues(role, evt)
 		}
 	}
+
+	var (
+		clientGoRequestMetricAdapterInstance     = clientGoRequestMetricAdapter{}
+		clientGoCacheMetricsProviderInstance     = clientGoCacheMetricsProvider{}
+		clientGoWorkqueueMetricsProviderInstance = clientGoWorkqueueMetricsProvider{}
+	)
+
+	clientGoRequestMetricAdapterInstance.Register(prometheus.DefaultRegisterer)
+	clientGoCacheMetricsProviderInstance.Register(prometheus.DefaultRegisterer)
+	clientGoWorkqueueMetricsProviderInstance.Register(prometheus.DefaultRegisterer)
+
 }
 
 // This is only for internal use.